Department of Data Science, Faculty of Information Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu-shi, Toyama, 939-0398, Japan.
Graduate School of Health Sciences, Niigata University, 2-746 Asahimachi-dori, Chuo-ku, Niigata-shi, Niigata, 951-8518, Japan.
Radiol Phys Technol. 2024 Dec;17(4):947-954. doi: 10.1007/s12194-024-00845-3. Epub 2024 Sep 18.
To verify the effect of the frame rate on image quality in cardiology, we used an indirect conversion dynamic flat-panel detector (FPD). We quantified the input-output characteristics, and determined the modulation transfer function (MTF) and normalized noise power spectrum (NNPS) of the equipment used in cardiology at 7.5, 10, 15, and 30 frames per second (fps). We also calculated the noise power spectrum for still images and videos at all frame rates and obtained the image lag correction factor r. The input-output characteristics and the MTF agreed even when the frame rate was varied. The NNPS tended to decrease uniformly as a function of frequency at increasing frame rates. The factor r decreased as a function of the frame rate, and its minimum value was 30 fps. Our results suggest that high-frame-rate imaging in cardiology using indirect conversion dynamic FPDs is affected by image lag.
为了验证帧率对心脏病学图像质量的影响，我们使用了间接转换动态平板探测器（FPD）。我们量化了设备的输入-输出特性，并确定了在 7.5、10、15 和 30 帧/秒（fps）下用于心脏病学的调制传递函数（MTF）和归一化噪声功率谱（NNPS）。我们还计算了所有帧率下的静态图像和视频的噪声功率谱，并获得了图像滞后校正因子 r。即使帧率发生变化，输入-输出特性和 MTF 也一致。随着帧率的增加，NNPS 呈均匀下降趋势。因子 r 随帧率的变化而减小，其最小值为 30 fps。我们的结果表明，使用间接转换动态 FPD 进行心脏病学的高帧率成像会受到图像滞后的影响。
